has been one of the tensest weeks of the entire obama presidency, just think about it, you had the bombing in boston on monday, followed by those ricin letters, one addressed to the president, another addressed up to a senator on capitol hill and, of course, you had the explosion in texas. now, obviously nothing connecting those other events with this but all contributing to a very tense week for the homeland security team. >> of course, this is the anniversary muof the waco bombings. i'm here with dan abrams, and let's talk a little more about the possibility that these men may have been from chechnya. that is an area known to be a hotbed of terrorism. >> and the question always is, how closely allied are the ch h chechen terrorists with al qaeda. they've been long fighting in russia. that's been their battle but the issue is that very often they have been bringing in from the arab peninsula and other places other fighters, have carous moussaoui was a recruiter for them. chechen fighters have long been fighting alongside u.s. forces in 2001 so no question there are questions.